Cisco Catalyst 2960 Software Configuration Manual page 371

Chapter 12 Configuring Interface Characteristics
For example, if the switch budgets 15,400 milliwatts on each PoE port, you can connect only 24 Class 0
powered devices. If your Class 0 device power requirement is actually 5000 milliwatts, you can set the
consumption wattage to 5000 milliwatts and connect up to 48 devices. The total PoE output power
available on a 24-port or 48-port switch is 370,000 milliwatts.
You should carefully plan your switch power budget and make certain not to oversubscribe the power
Caution
supply.
When you manually configure the power budget, you must also consider the power loss over the cable
Note
between the switch and the powered device.
When you enter the power inline consumption default wattage or the no power inline consumption
default global configuration command, or the power inline consumption wattage or the no power
inline consumption interface configuration command this caution message appears:
%CAUTION: Interface interface-id: Misconfiguring the 'power inline consumption/allocation'
command may cause damage to the switch and void your warranty. Take precaution not to
oversubscribe the power supply.
It is recommended to enable power policing if the switch supports it.
Refer to documentation.
If the power supply is over-subscribed to by up to 20 percent, the switch continues to operate but its
reliability is reduced. If the power supply is subscribed to by more than 20 percent, the short-circuit
protection circuitry triggers and shuts the switch down.
For more information about the IEEE power classifications, see the
on page
Beginning in privileged EXEC mode, follow these steps to configure the amount of power budgeted to a
powered device connected to each PoE port on a switch:
Command
Step 1
configure terminal
Step 2 no cdp run
Step 3 power inline consumption default
wattage
Step 4
end
Step 5 show power inline consumption
Step 6 copy running-config startup-config
To return to the default setting, use the no power inline consumption default global configuration
command.
OL-26520-01
12-5.
Purpose
Enter global configuration mode.
(Optional) Disable CDP.
Configure the power consumption of powered devices connected to each
the PoE port on the switch.
The range for each de vice is 4000 to 15400 milliwatts on a PoE switch
and 4000 to 30000 milliwatts on a PoE+ switch. The default is 15400
milliwatts on a PoE switch and 30000 milliwatts on a PoE+ switch.
Note
Return to privileged EXEC mode.
Display the power consumption status.
(Optional) Save your entries in the configuration file.
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
When you use this command, we recommend you also enable
power policing.
Configuring Ethernet Interfaces
"Power over Ethernet Ports" section
12-35